Austin k



(No Model.) v l A, K.HSPENCER 8v C. A. SMITH.

- KEY HOLE GUARD. No. 352,015. vPadaenjsed Nov.. 2, 1886-.

MM c5 UNITED STATES PATENT EEICE.

AUSTIN K. SPENCER AND CHARLES A. SMITH, or cLovEnsvrLLE, N. Y.

KEY-HOLE GUARD. l-

SPECIFICATION forming part o Letters Patent No. 352,015, dated November 2, 1886.

I Application tiled September 29, 1886. Serial No. 214.863. (No model.)

To all whom it may concerm` 4Be it known that we, AUSTIN K. SPENCER and CHARLES A. SMITH, citizens of the United without to the interior mechanism of the lock.

through the key-hole after the key has been withdrawn from said key-hole; and the invention consists, essentially, of a sliding bolt or plate located within the casing of the lock, and actuated by a two-winged tumbler and other suitable mechanism, so as to lie and be secured across the keyway intermediate between the u two ends thereof, and thus obstruct the entran ce of a picking-tool from either direction; and it further consists in peculiarities ofthe construction and combination, as will be fully set forth.

In the annexed drawings, illustrating our invention, Figure 1 is an elevation of a portion of the door where the lock is situated, and shows the key-hole and the handle or knob for manipulating the interior guardbolt. is a plan view of a lock-casingwith the top plate removed, and shows the guard in the position it occupies when the keyway is not covered. Fig. 3 is a similar View showing the guard over the keyway. Fig. 4c is a cross-section on the line 1 1 of Fig. 2. Fig. 5 is a crosssection on the line 2 2 of Fig. 3, and Fig. 6 is a perspective View of the guard-bolt.

Like letters indicate like partsthroughout the several views. i

A represents an ordinary rectangular lockcase, within which the mechanism of the lock and likewise of our improved key-hole guard is situated.

B denotes thesliding guard-bolt. It is shown in an inverted position in Fig. 6 in order to expose more clearly its structural details. This bolt slides upon the face a, which, when the Fig. 2

bolt is in proper position, will be in contactA with the side of the casing, as shown in Figs. n

2 and 3. The upper face, b, of the bolt is provided with a slot or depression, which receives the end of a spring, C. Further, said guardbolt is reduced in size at one end to a thin plate, c, which is slotted and provided between the slot and the extremity of the plate with a rounded projection, d. One side, also, ofthe bolt is rabbeted at e. The guard-bolt slides upon vthe side of the casing, as above mentioned, and is guided in its movements by pins or projections f f on the back plate of the casing, which pins lie one on each side of the thin portion c of the bolt. The rabbeted character of one lface of the bolt ate allows ample room for thelower pin, f, and permits a considerable movement of the bolt without being obstructed by said pin.

Thebolt is actuated by means ofa two-winged' tumbler consisting of a spindle, g, which is j ournaled in the rear and top plates of the lockcasing at a point near the thin end of bolt B, and which is provided with arms or wings h h', extending approximately at right angles to each other. When the spindle is rotated, the arms h h will be brought in contact with the projection d, and thus the bolt may be pushed forward or backward. The spring C, one of whose ends enters the top of the bolt B, is secured, preferably, around the postst and j, as shown in the drawings; but other means may obviously be used to hold the end of it firm, and its function is to so act on the bolt as to push it ina direction away from the key-hole. Suppose, now, the guard-bolt to be in the position shown in Fig. 2. It does not cover the keyway. The projection dis between the arms or wings hh. Now, if the spindle gbe rotated, the arm h will be caused to bear hard upon the projection d, and thus shoot the guard-boltover into the position shown in Fig. 3, where it completely covers the keyway. In this position the arm h will be nearly in line with the bolt,

' and will bear upon the projection d in such a manner as to eectually lock the bolt and prevent any one from pushing it backward by the introduction of prying or picking tools into the keyway, or by other means.` Alug, m, on the casing serves to keep the arm h from passing beyond a certain point, and thus assists IOO the actuating-tumbler in maintaining its locking position. \Vhen it is desired to uncover the keyway, the spindle g is rotated in a reverse direction. The spring C will now, as soon as the bolt is relieved of the pressure ofthe arm hf, drive it a short distance, or far enough to allow the arm h to come into contact with the projection d, and thus replace the bolt in the position shown in Fig. 2. Should it be dcsired to push the bolt still farther, the arm h will be allowed plenty ofroom in which to make the movement, for it can enter the slot in the thin part of the bolt.

In order to conveniently rotate the twowinged tumbler, we have provided aknob, D, which is inserted through a perforation in the door adjoining theend of the spindle g, and the inner end of whose shank is flattened to adapt it to enter the slotted end of said spindle g. This knob is supported by a perforated circular cap, E, through which it passes, said cap being secured to the door by screws or other convenient means. rlhe knob and its shank are kept in place within the cap by a lug, o, on the shank, the perforation on the cap being indented at o to allow the lug to be passed within the saine.

Having thus described our invention, what we claim as new, and desire to secure by Letters Patent, is-

1. The combination of the lock-casing having lugs fand f 011 the back plate and the lug m on one side, the bolt B, rabbeted at e, and having f projection d, the spring C, the spindle g,journaled in the lock-casing, and 35 having arms 7i 7L', and the knob D, for rotating the spindle, all arranged substantially as shown and described.

2. The combination of the lock-easing having lugsfandf on the back plate and the lug m on one side, the bolt B, having projection d, and rabbeted at e, the spring C, and actuating mechanism for the said bolt, substantially as described.

In testimony whereof we affix our signatures 4.5 in presence of two witnesses.

AUSTIN K. SPENCER. CHARLES A. SMITH.

XVitnesses:

JOHN H. DUNsoN, CHARLEs H. CLARK. 

